By segment, we mean for example full size sedans, intermediaries, full-size sport-utility vehicles, full-size pick-ups etc .. You can think of segments as categories. In each segment, mishaps cars that sell well and others that don’t sell also. In the intermediary segment, Toyota Camry and Honda Accord are the leaders, protected Chevrolet Malibu and Kia Magentis sell less than half may find cars just like the leaders (2011 data). Therefore that even if you paid your Kia Magentis the same price because would have paid a Honda Accord, you will still get less in trade-in value for the Kia despite having identical mileage and model year.